Improvement in slide-valves



' erence especially to figs. 1 and 2.'

anni sala aan eine JAMES' SMART, 0E. STRATFORD, ENGLAND.

Letters `Patent No. 110,300, dated December 20, 1870.

IMPROVEMENT-IN SLIDE-VALVES.

To all fr vhom it may concern A y Be it known that I, `JAMES SMART, ofStratford, Essex, England, have inventedcertan new and usefulImprovements in SlideValves; and I do hereby deelare that the followingis a full and exact description thereof', reference being had to theaccompanying drawing and to the let-ters of reference marked thereon.The slide-valve is made hollow, the steam passing from one side of thevalve through the same, and then through the' portson the cylinder face.

The steam-receiving side of the valve works steam' tight against acorresponding face having an oblong hole, through which the steam entersthe valve.

. made 4sure to run steam tight on ,both sides.

l The accompanying drawing represents the valve in some of itsapplications.

Figure l is atransverse section of a steam-cylinder i tted with theimproved slide-valve.

Figure '2 is a longitudinal horizontal section of the same ;g andFigure, a sideelevation ofthe same.

The principle will be clearly understood by refer- `lfhe steam entersfrom the steam-pipe at A, passes through the spaces B and B, and theopenings G and C to the top or bottom part D' D on the face of lthe ocylinder, which is made of any ordinary construction,

the valve being adapted to the same.

rl'he opposite, in this case the lower, side of the valve has falseports of about the same area as theports on the other side of the valve,as shown in the dotted lines in figs. 1 and 3. This lower side of thevalve works against a hollow V-shaped facing-piece, E, shown in outsideview in g. 4. It may be adjusted or pressed' against the valve by meansof screws or springs.

The condensed water passes into' the interior of the adjustable face,thus relieving the valve from'water, and consequent pressure. It isdrawn off from there' by cocks or Avalves in the ordinary way. I

This valve being a. perfect equilibrium valve, as practice has shown,and no steam passing from the Vinterior to the back of it, there is noneed for the ordinary slide-jacket and cover, alight casing beingSudicientto keep the heat in. l l o Stuffing-boxes and glands are alsodispensed with, as shown, and there is no .loss of .steam outside thevalve.

The slide-valve is also easily removed when required.

The steam likewise takes the shortest and most direct rout to thecylinder.

. Figure 5 is a section of a'valve cast in steclor gun4 metal, in one,with' its spindle. Y v

Figures 6 and 7 show the valve applied to inside cylinders, locomotives,or other steam-engineshaving one common steamchest for two cylinders.

The adjustable facing in fig. 6 is the former shown in two pieces, andin Iig. 7 in one.

In all cases it is advisable that the facing should be keptin positionby projecting lugs F F fitting into corresponding holes or recesses.

What I claim as my invention,4 and desireto sc-l cure byLetteI-s Patent,is-

1. The construction of a slide-valve, having ports or openings on twoopposite sides, through which the steam is admitted to the interior ofthe valve, or through -the ports on one side only, the said valve beingformed with a chamfer on one or both such sides, substantially asdescribed and illustrated by the accompanyin g drawn g.

2. The construction and arrangement of the hollow steam-chamber, againstwhich the slide-valve works.

3. The arrangement of a hollow facing, against which the slide-valveworks, for the purpose of adjust- Lnent and draining and 4. Thecombinationof the slide-valve, steam-chamber, and hollow adjustablefacing, substantially as'described and illustrated. y

. JAMES SMART.v Witnesses:

EDWD. GRIFFITH BREWER,

89 Chancery Lane. EDWIN PLANTA.

